Измерение поперечного размера глазного яблока методом В-сканирования с использованием линейного датчика

Abstract

Purpose. To evaluate the feasibility of measuring the transverse size of the eyeball by B-scan with a linear probe in patients with horizontal strabismus. Material and Methods. The study included 56 children (56 eyes) aged 2 to 15 years with previously not operated horizontal strabismus. Two independent operators used B-scan method to measure the axial length (for comparison with A-scan data) and the transverse size of the eyeball according to the proposed method. The accuracy of measurements was estimated by calculating the reproducibility limit, and indirectly by the forecast accuracy of the software system STRABO, which used the obtained values of the transverse size of the eyeball for individual dosing operations. Results. The B-scan technique was developed for measuring the transverse size of the eyeball using a contact linear probe. The measurement reproducibility limit was 0.22 mm (95% confidence interval is 0.18–0.25 mm), which does not exceed 1% of the average transverse size of the eyeball (22.03 mm). The results of the operations confirmed the accuracy of the prediction by the software system STRABO, since the correct eye position was obtained within 6 months in all cases, excluding 4 patients in whom the second stage of the surgery was postponed. That gave an indirect confirmation of the measurement accuracy of the transverse size of the eyeball using the proposed technique. Conclusion. The proposed ultrasound B-scan technique with a linear contact probe provides high accuracy and reproducibility of measurements of the transverse size of the eyeball and can be used in pediatric ophthalmological practice for calculating surgical procedures for strabismus using the individual dosing software system STRABO. Key words: transverse size of the eyeball, axial length, ultrasound B-scan, linear probe, horizontal strabismus, dosing.